Error on empty character vector args in undesirable linters

[IndrajeetPatil]

Closes #1867

[IndrajeetPatil]

Builds are failing on R 3.4 because of {purrr}. No idea why.

 ✖ Failed to build purrr 1.0.0
  Error: 
  ! error in pak subprocess
  Caused by error in `stop_task_build(state, worker)`:
  ! Failed to build source package 'purrr'

[codecov-commenter]

Codecov Report

Merging #1870 (bbfb366) into main (8c05027) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1870   +/-   ##
=======================================
  Coverage   98.86%   98.86%           
=======================================
  Files         112      112           
  Lines        4839     4841    +2     
=======================================
+ Hits         4784     4786    +2     
  Misses         55       55           

Impacted Files	Coverage Δ
R/undesirable_function_linter.R	100.00% <100.00%> (ø)
R/undesirable_operator_linter.R	100.00% <100.00%> (ø)

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